<html>
  <head>
    <title>疯狂背单词 - Crossin的编程教室</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    {% block head %}
    {% endblock %}
    <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.0.0-beta/css/bootstrap.min.css">
    <script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.js"></script>
    <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
    <script src="https://cdn.bootcss.com/bootstrap/4.0.0-beta/js/bootstrap.min.js"></script>
  </head>
  <body align="center" class="container">
    {% block content %}
    {% endblock %}
  </body>
</html>
